I've been having spike in load over the last week. This usually occurs once or twice a day. I've managed to identify from iotop that [jbd2/md1-8] is using 99.99 % IO. During the high load times there is no high traffic to the server.

Server specs are:

• AMD Opteron 8 core
• 16 GB RAM
• 2x2.000 GB 7.200 RPM HDD Software Raid 1
• Cloudlinux + Cpanel
• Mysql is properly tuned

Apart from the spikes, the load usually is around 0.80 at most.

I've searched around but can't find what [jbd2/md1-8] does exactly. Has anyone had this problem or does anyone know a possible solution?

Thank you.

UPDATE:

TIME        TID     PRIO     USER    DISK READ    DISK WRITE    SWAPIN  IO       COMMAND
16:05:36     399     be/3    root    0.00 B/s      38.76 K/s    0.00 %  99.99 %  [jbd2/md1-8]